How to Configure an ASA5510 to Recognize Multiple Public IP Addresses

Written by jonah quant
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How to Configure an ASA5510 to Recognize Multiple Public IP Addresses
The Cisco ASA 5510 security appliance can use multiple IP addresses. (ADSL Router image by Phil2048 from

The Cisco ASA 5510 is a hardware security appliance for enterprise-level computer networks. Among other functions, an ASA 5510 can operate as a firewall that makes only some hosts behind the firewall visible from the open Internet --- and performs Network Address Translation (NAT) for them. Even if an ASA 5510 has a single network interface on the Internet side, the administrator can still assign multiple public IP addresses to that interface. Each public IP address can get mapped by NAT to a host behind the firewall, or to the configuration interface of the ASA 5510.

Skill level:

Things you need

  • Administrator access to the ASA 5510
  • Console cable for the ASA 5510

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  1. 1

    Connect your computer to the ASA 5510 using the console cable. Invoke the terminal emulator on the computer with parameters:

    • 9600 baud

    • 8 data bits

    • no parity

    • 1 stop bit

    • no flow control.

  2. 2

    Press "Enter" to see the "hostname>" prompt from the ASA 5510. Execute the command "enable" (without quotes) to get into privileged mode. You will have to enter the administrator password.

  3. 3

    Enter the configuration commands using the command line, one by one and pressing "Enter" after each one. The "static" configuration command maps external addresses to internal addresses (Static NAT). The concrete sequence of commands depends on your situation. For example, if you want to configure the ASA 5510 to use public IP addresses and for internal hosts and, respectively, enter these commands:

    interface Ethernet0/0

    nameif outside

    security-level 0

    static (inside,outside)

    static (inside,outside)

    The ASA 5510 is now configured for multiple public IP addresses.

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